I didnt read even the OP in this thread...but move up as soon as you can beat NL25...even if you only have $500. If you lose 2 stacks or whatever move back down, rinse and repeat. First off, 50NL is ridiculously easy, and secondly you'll beat NL25 even better after moving up then down...any decent 25NL player is losing massive amounts of money (to them) by practicing good BR management at that level. BR management is much more important at levels that actually have good deals of variance (ie, 100+...and even then it may start at 200NL)